愛情中o架“閃電效應”用英文應該點講？

Cupid struck their hearts with the arrow of love at first sight.
Simon fell in love with Helen at first sight.
Love-at-first-sight happened as they met each other for the very first time.
It was love at first sight when XXX first met XXXX.
Simon had a big crush on Helen on their first date.
There was chemistry between them when they first met each other.

閃電效應
Chemistry effect in a flash.
Jack & Diane met & have chemistry effect in a flash.
Please check & find out the meaning of:
1) chemistry -
2) in a flash -
Thank you

一見鐘情既英文應該係 "love at first sight"
希望幫到你啦~~~